Missing 'Previous' and 'Next' buttons on some documentation pages

The [**WYSIWYG Components**](https://developers.front-commerce.com/docs/reference/wysiwyg.html) page is missing a **Previous** button at the bottom of the page.

The [**GraphQL context**](https://developers.front-commerce.com/docs/reference/graphql-context.html) page is missing a **Next** button at the bottom of the page.